Dental unit



FIG. 1 is a front perspective view of a dental unit showing my new design;

FIG. 2 is a front face view thereof,

FIG. 3 is a right-hand side view thereof,

FIG. 4 is a left-hand side view thereof,

FIG. 5 is a rear face view thereof,

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for dental unit, as shown and described. 